Hi. It's definitely not a new Xserver bug since it's possible to trigger it using simple dri driver capability advertising changes. What happens is that Kwin (or whatever is drawing this) is getting a different visual or fbconfig than what it's used to. So what's needed is to understand why that new visual renders differently than the old one. 



21 sep. 2017 kl. 10:44 skrev "bugzilla-daemon@freedesktop.org" <bugzilla-daemon@freedesktop.org>:

Comment # 18 on bug 102806 from 
Hey Thomas,

I have reproduced this issue using the OpenGL ES Compositor on Kwin, so Martin
believes that this is in fact an Xserver bug. See his post on the KDE Bugzilla
for more info.

Let me know how to proceed.

Thanks,
Sarnex

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